We look at the division of 12409767 by 77 
We're looking to find how many times 77 goes into 12409767.

Going ahead to step 1:
The number 77 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 77

Going ahead to step 2:
12 divided by 77 is 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 77

On to step 3:
77 goes into 124 1 times with a remainder of 47.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 77 from 124, we get 47.
Fetch the next digit (0) from the dividend, attach it to 47 and continue: 470 / 77

Let's proceed to step 4:
77 can be fit into 470 6 times, resulting in a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
The remainder is 8 after subtracting 462 from 470.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 77

Advancing to step 5:
If we divide 89 by 77, we get 1 and a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 161.0
If we take 77 away from 89, we end up with 12.
Append the next digit (7) from the dividend to 12 and continue with: 127 / 77

Advancing to step 6:
127 divided by 77 is 1 with a remainder of 50.
Write down 1 as next digit of the result. 
Result so far: 1611.0
If we subtract 77 from 127, we get 50.
Grab the next digit (6) from the dividend, add it to 50, then carry on: 506 / 77

Step 7:
77 can be fit into 506 6 times, resulting in a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 16116.0
The remainder is 44 after subtracting 462 from 506.
Include the next digit (7) from the dividend after 44, then repeat: 447 / 77

Advancing to step 8:
The number 77 fits into 447 5 times, leaving a remainder of 62.
Use 5 as the next digit of our solution. 
Result so far: 161165.0
Subtract 385 from 447 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 9:
When dividing 620 by 77, we get 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 161165.8
Deduct 616 from 620 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
40 divided by 77 is 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 161165.8
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 11:
If we divide 400 by 77, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 161165.805
If we take 385 away from 400, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
77 goes into 150 1 times with a remainder of 73.
Record the quotient 1 as the next digit in the result. 
Result so far: 161165.8051
The remainder is 73 after subtracting 77 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 13:
77 can be fit into 730 9 times, resulting in a remainder of 37.
Use 9 as the next digit of our solution. 
Result so far: 161165.80519
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 14:
77 goes into 370 4 times with a remainder of 62.
Write down 4 as next digit of the result. 
Result so far: 161165.805194
Subtract 308 from 370 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 15:
77 can be fit into 620 8 times, resulting in a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 161165.8051948
Deduct 616 from 620 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 16:
If we divide 40 by 77, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 161165.8051948
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 161165.8051948, with a leftover of 4e-08.